WA HB1749

Adds four new required elements to Washington's State Environmental Policy Act (SEPA) checklist: climate change, carbon sequestration, treaty-protected resources, and environmental pollutant exposures for overburdened communities and vulnerable populations

Requires lead agencies to evaluate whether proposed actions significantly increase life-cycle greenhouse gas emissions, including emissions generated outside the project's physical boundaries

Mandates consideration of impacts on carbon sequestration in state and private forestlands, urban forests, soils, agricultural lands, and marine environments, with a 20-year threshold for restoration mitigation on state lands

Requires assessment of whether projects preserve, enhance, or adversely affect tribal treaty-protected resources, including potential health risks to tribal members exercising gathering, hunting, and fishing rights

Directs the Department of Ecology to adopt guidance defining significant emission levels and to update WAC 197-11-444 and WAC 197-11-960 to incorporate the new environmental elements